* {
    margin: 0;
    padding: 0;
}
//清除浮动
.cleafix::after {
    content: '';
    height: 0;
    display: block;
    clear: both;
    visibility: hidden;
}
.cleafix {
    *zoom: 1;
}

//左浮动
.left {
    float: left;
}
//右浮动
.right {
    float: right;
}


//字体大小
$bigFontSize: 24px;
$middleFontSize: 18px;
$smallFontSize: 14px;